Following the story of Ran, who confronts a mysterious organization by participating in a no-rules deathmatch after discovering her missing younger sister Yuzuki is involved in a crime. With danger at every corner, Ran must trade in her boxing gloves for brass knuckles. Will she save her sister?
Unfortunately the movie Knuckle Girl is not yet available on HBO Max.
| Directing | Chang | Director |
| Writing | Jung Byeong-sik | Adaptation |
| Directing | Choi Bong-rock | Action Director |
| Directing | Shinsuke Fujimoto | First Assistant Director |
| Writing | JGstreet | Original Story |
| Production | Ryota Miyamoto | Production Manager |
| Writing | Soichiro Ojima | Screenplay |
| Writing | Yoo Gap-yeol | Screenplay |
| Camera | Takuro Ishizaka | Director of Photography |
| Lighting | Katsutoshi Hirano | Lighting Technician |
| Sound | 平直樹 | Sound Recordist |
